Its his birthday? Happy Birthday!!
-------------------------
(and I was thinking more of the +1 food ... but since you were thinking of increasing the gold anyways ... I guess a trade mission is better, but as I've never trade-missioned before, I was mainly thinking about boosting the gold + additional food in the city)
But yes, I was thinking more in the abstract, and less in the (20 turns before end of the game) mode.
Still though, how much gold will the trade mission give?
Assuming 20+ turns until the end of the game, that is 180 gold from the GM at least. Likely closer to 260 if he has gold modifying buildings there. Not to mention the +1 food.
I'd think, considering turns for the trade mission, it would have to make at least 300 gold for me to even consider doing the mission vs making the plant. But as I have little experience with trade missions I don't know whats common ...
(If you are sitting in a foreign city, is there a tool tip that says how much you would get?)